Stoker



R. E. DRAWZ sToKE Filed July 18, 1938 INVENTok. /Poy @P4/wz B Y ATTORNEY.

Agg. 26, 1941.

Patented Aug. 26, 1941 UNITED STATES PATENT eerie-lsy STOKER Roy E.Drawz, Minot, N. Dak.

Application July 18, 1938, Serial No. 219,796

2 Claims.

This invention relates to stokers and particularly to tuyres therefor.

The prior patent to Palda, No. 1,800,747, issued April 14, 1931,`discloses .a type of stoker in which air is supplied to the fire bedabove the grate through a horizontal tuyre disposed concentrically ofand about the discharge end of the fuel supply tube or conduit.

An object of the present invention is to provide an Yimproved .tuyre fora stoker of that type which will effect eicient distribution of the aircharge, which will not be materially affected by the temperatures towhich it may normally be subjected, and which may be inexpensivelyproduced.

Other more specific objects and advantages will appear, expressed orimplied, from the following description of Ian illustrative embodimentof this invention.

In the accompanying drawing- Figure 1 is a View part in section and partin elevation of the discharge end of a stoker embodying the presentinvention.

Fig, 2 is a bottom plan View of one of the tuyre rings shown in Fig. l.

The stoker partially shown in Figs. 1 and 2 is of 'a type disclosed inthe patent above identif-led, and includes the usual fuel conductor tubeI through which fuel is directed in a well known manner, from aconventional hopper an-d power driven feed mechanism, through the grateto the fire bed thereabove. The tube shown has the usual upturneddischarge end II. The stoker shown also includes an Iair channel I2,surrounding the tube I0 and having an upturned end I3, through which airis blown into the re bed to promote combustion.

In this instance the air conductor channel I2 terminates in a tuyre I4specially designed to effect eflicient distribution of the dischargedIair into fthe fire bed and to effectively resist the high temperaturesinvolved and thereby avoid the consequent deteriorating effects thereon,such as is ordinarily experienced in stokers of this type heretoforeused. The tuyre shown in Fig. 1 comprises a plurality of separate andseparable concentric rings I5, I6, I1 and I8 preferably of differentdiameters, stacked one upon another, and spaced apart to providecircular gaps I9 therebetween through which the air may flow radiallybetween the rings. To insure such spacing and to determine the width ofthe resulting gaps, spacer lugs 20 lare provided, preferably upon thebottom of each upper ring for engagement with the ring below.

In the tuyre of Fig. 1, the upper ring I5 is the smallest and isattached to the upturned end II of the fuel conductor tube, the lowerring I8 is considerably larger and is attached to the upturned end I3 ofthe air conductor channel, and the intermediate rings I6 and I'I are ofdifferent intermediate diameters so that the resulting composite tuyreis of tapered substantially conical form. Although the several rings arepreferably circular and of substani tially' uniform width, they may berectangular, hexagonal, or other polygonal shape.

It will be noted that the rings, and particularly the rings I6, I'I, andI8 are provided with upstanding ribs 2l, or otherwise thickened, attheir outer peripheries, so as to increase the heat absorbing capacityof those portions which are exposed to the heat of the fire bed, theuneXpo-sed bodies of those rings extending inwardly from the outerthickened portions serve to dissipate the heat thus absorbed. It willalso be noted that the upstanding peripheral rib formation on each ringtends to deflect the air upward about and along the outer surface of thering above to effectively cool the latter. Furthermore, these ribs bythus deflecting the air tend to break the force of the air blast andthereby effect a better distribution of the air throughout the re bed.Also, this upward deflection of the Iair and reduction in the force ofthe blast somewhat reduces the tendency of the ash to be blown from theburner to the sides of the lire bed and results in a building up of there bed to a height above the burner, thus insulating the rings from theheat of the fire and also reducing the tendency of theincoming fuel tocoke prematurely.

Various changes may be made in the embodiment of the inventionhereinabove specifically described without departing from or sacrificingthe advantages of the invention as denn-ed in the appended claims.

I claim:

1. A tuyre for stokers comprising a plurality of concentric rings ofgraduated sizes superposed to form a hollow substantially conicalstructure, spacer lugs separating said rings to provide gapstherebetween for the radial discharge of air therebetween, upstandingconcentric ribs formed along the outer peripheries of said rings, eachof said ribs having an ash-supporting top face and also having anupright inner face encircling and covering but spaced from the gap belowthe next adjacent upper ring thereby to break the force of the issuingair stream and to direct the air at low Velocity up- Wardly past theperiphery of the next adjacent upper ring Without disturbing ash lodgedupon said top faces of said ribs.

2. A tuyre for stokers comprising a plurality 5 of concentric rings ofgraduated sizes superposed to form a hollow substantially conicalstructure, said rings being provided with openings therebetween for theradial discharge of air therebetween, upstanding concentric ribs 10formed along the outer peripheres of said rings,

